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Abstract:

A method of and apparatus for incorporating primary components of an EAS
system into hand-supportable and countertop-supportable bar code symbol
reading systems having a housing with a light transmission window covered
by an optically transparent faceplate having outer dimensions closely
matched to the light transmission window. About the optically transparent
faceplate, a faceplate bezel is mounted embodying a coil of electrically
conductive wire having terminals connected to an electrical interface
circuit, which is connected to a flexible EAS cable extending from the
electrical interface circuit. The flexible EAS cable extends towards
electrical drive circuitry associated with the EAS subsystem, for
powering the coil during EAS tag deactivation operations controlled by
the host computer system.

Claims:

1. A bar code symbol reading system for use in conjunction with an
electronic article surveillance (EAS) subsystem interfaced with a host
computer system, said bar code symbol reading system comprising: a
housing having a light transmission window covered by an optically
transparent faceplate having outer dimensions closely matched to said
light transmission window; a bar code symbol reading subsystem, disposed
in said housing, for optically reading bar code symbols on bar-coded
products that are passed in front of said optically transparent
faceplate, and generating symbol character data for each bar code symbol
read by said bar code symbol reading subsystem; a faceplate bezel having
a front surface, a rear surface, and a rectangular shaped aperture having
dimensions closely matched to the outer dimensions of said optically
transparent faceplate, and a base portion which extends from the bottom
portion of said faceplate bezel and has a front surface and a rear
surface as well, and a recessed cavity formed in said rear surface of
said base portion, a groove formed in the rear surface of said faceplate
bezel, extending all around said rectangular shaped aperture, and at a
depth sufficient to recess at least a first coil of electrically
conductive wire embedded in said groove, and having terminals that
terminate at said recessed cavity and which are connected to an
electrical interface circuit mounted within said recessed cavity, wherein
said electrical circuit is connected to a flexible EAS cable extending
from said electrical interface circuit towards electrical drive circuitry
associated with said EAS subsystem, for powering said first coil during
EAS tag deactivation operations controlled by said host computer system;
and wherein said first coil generates an electromagnetic EAS field in the
vicinity of said optically transparent faceplate, for deactivating an EAS
tag on a purchased product presented within said 3D code reading volume,
during EAS tag deactivation operations.

2. The bar code symbol reading system of claim 1, wherein said EAS
subsystem further comprises a second coil of electrically conductive wire
embedded in said groove, and having terminals that terminate at said
recessed cavity and which are connected to said electrical interface
circuit; wherein said flexible EAS cable also conducts signals from said
second coil to EAS tag detection circuitry operably connected to said
host computer system; and wherein said second coil generates a second
electromagnetic EAS field in the vicinity of said optically transparent
faceplate, to detect said EAS tag on a product presented within said 3D
code reading volume, during EAS tag detection operations.

3. The bar code symbol reading system of claim 1, wherein said bar code
symbol is realized using a 1D or 2D bar code symbology.

4. The bar code symbol reading system of claim 1, wherein said EAS
subsystem further comprises a power generation circuit for generating a
first electrical signal supplied to said first coil EAS tag deactivation
operations.

5. The bar code symbol reading system of claim 1, wherein said EAS
subsystem is based on physics selected from the group consisting of
magneto-harmonic; magneto-strictive; and radio-frequency.

6. The bar code symbol reading system of claim 1, wherein said bar code
symbol reading subsystem comprises one or more of a laser scanning bar
code symbol reader and a digital-imaging bar code symbol reader.

7. The bar code symbol reading system of claim 1, wherein said housing is
supportable within a hand of an operator and/or supportable on a
countertop surface.

8. A bar code symbol reading system for use in conjunction with an
electronic article surveillance (EAS) subsystem interfaced with a host
computer system, said bar code symbol reading system comprising: a
housing having a light transmission window covered by an optically
transparent faceplate having outer dimensions closely matched to said
light transmission window; a bar code symbol reading subsystem, disposed
in said housing, for optically reading bar code symbols on bar-coded
products that are passed in front of said optically transparent
faceplate, and generating symbol character data for each bar code symbol
read by said bar code symbol reading subsystem; a faceplate bezel
structure, realized as a printed circuit (PC) on a flexible substrate,
having a front surface, a rear surface, and a rectangular shaped aperture
having dimensions closely matched to the outer dimensions of said
optically transparent faceplate, and a base portion which extends from
the bottom portion of said faceplate bezel structure and has a front
surface and a rear surface as well; a first coil of electrically
conductive wire provided on said rear surface about said rectangular
shaped aperture, and having terminals that are connected to an electrical
interface circuit provided on the surface of said base portion; wherein
said electrical interface circuit is connected to a flexible EAS cable
extending from said electrical interface circuit towards electrical drive
circuitry associated with said EAS subsystem, for powering said first
coil during EAS tag deactivation operations controlled by said host
computer system; and wherein said first coil generates an electromagnetic
EAS field in the vicinity of said optically transparent faceplate, for
deactivating an EAS tag on a purchased product presented within said 3D
code reading volume, during LAS tag deactivation operations.

9. The bar code symbol reading system of claim 8, wherein said EAS
subsystem further comprises a second coil of electrically conductive wire
also provided on said rear surface about said rectangular shaped
aperture, and having terminals that are connected to said electrical
interface circuit provided on the surface of said base portion; wherein
said flexible EAS cable also conducts signals from said second coil to
EAS tag detection circuitry operably connected to said host computer
system; and wherein said second coil generates a second electromagnetic
EAS field in the vicinity of said optically transparent faceplate, to
detect said EAS tag on a product presented within said optically
transparent faceplate, during EAS tag detection operations.

10. The bar code symbol reading system of claim 8, wherein said bar code
symbol is realized using a 1D or 2D bar code symbology.

11. The bar code symbol reading system of claim 8, wherein said EAS
subsystem further comprises a power generation circuit for generating a
first electrical signal supplied to said first coil EAS tag deactivation
operations.

12. The bar code symbol reading system of claim 8, wherein said EAS
subsystem is based on physics selected from the group consisting of
magneto-harmonic; magneto-strictive; and radio-frequency.

[0004] The use of bar code symbols for product and article identification
is well known in the art. Presently, various types of bar code symbol
scanners have been developed for reading bar code symbols at retail
points of sale (POS).

[0005] Also, over the years, electronic article surveillance (EAS) methods
have been developed to prevent shoplifting in retail stores or pilferage
of books from libraries. Special tags are fixed to merchandise or books.
These tags are removed or deactivated by the clerks when the item is
properly bought or checked out at a POS station. At the exits of the
store, a detection system sounds an alarm or otherwise alerts the staff
when it senses "active" tags. For high-value goods that are to be
manipulated by the patrons, wired alarm clips may be used instead of
tags.

[0006] Currently, several major types of electronic article surveillance
(EAS) systems have been developed, namely: magnetic-based EAS systems,
also known as magneto-harmonic; acousto-magnetic based EAS systems, also
known as magnetostrictive; and radio-frequency based EAS systems.

Magnetic-Based EAS Systems

[0007] In magnetic-based EAS systems, the tags are made of a strip of
amorphous metal (metglas) which has a very low magnetic saturation value.
Except for permanent tags, this strip is also lined with a strip of
ferromagnetic material with a moderate coercive field (magnetic
"hardness"). Detection is achieved by sensing harmonics and sum or
difference signals generated by the non-linear magnetic response of the
material under a mixture of low-frequency (in the 10 Hz to 1000 Hz range)
magnetic fields. When the ferromagnetic material is magnetized, it biases
the amorphous metal strip into saturation, where it no longer produces
harmonics. Deactivation of these tags is therefore done with
magnetization. Activation requires demagnetization. This type of EAS
system is suitable for items in libraries since the tags can be
deactivated when items are borrowed and re-activated upon return. It is
also suitable for low value goods in retail stores, due to the small size
and very low cost of the tags.

Acousto-Magnetic Based EAS Systems

[0008] These EAS systems are similar to magnetic-based EAS systems, in
that the tags are made of two strips of metal, namely: a strip of
magnetostrictive, ferromagnetic amorphous metal, and a strip of a
magnetically semi-hard metallic strip, which is used as a biasing magnet
(to increase signal strength) and to allow deactivation. These strips are
not bound together, but are free to oscillate mechanically. Amorphous
metals are used in such systems due to their good magneto-elastic
coupling, which implies that they can efficiently convert magnetic energy
to mechanical vibrations. The detectors for such tags emit periodic tonal
bursts at about 58 kHz, the same as the resonance frequency of the
amorphous strips.sup.[3]. This causes the strip to vibrate longitudinally
by magnetostriction, and to continue to oscillate after the burst is
over. The vibration causes a change in magnetization in the amorphous
strip, which induces an AC voltage in the receiver antenna. If this
signal meets the required parameters (correct frequency, repetition etc.)
the alarm is activated.

[0009] When the semi-hard magnet is magnetized, the tag is activated. The
magnetized strip causes the amorphous strip to respond much more strongly
to the detectors, because the DC magnetic field given off by the strip
offsets the magnetic anisotropy within the amorphous metal. The tag can
also be deactivated by demagnetizing the strip, making the response small
enough so that it will not be detected by the detectors. These tags are
thicker than magnetic tags and are thus seldom used for books. However
they are relatively inexpensive and have better detection rates (fewer
false positives and false negatives) than magnetic tags.

Radio-Frequency Based EAS Systems

[0010] The Series 304 RF EAS label is essentially an LC tank circuit that
has a resonance peak anywhere from 1.75 MHz to 9.5 MHz. The most popular
frequency is 8.2 MHz. Sensing is achieved by sweeping around the resonant
frequency and detecting the dip. Deactivation for 8.2 MHz label tags is
achieved by detuning the circuit by partially destroying the capacitor.
This is done by submitting the tag to a strong electromagnetic field at
the resonant frequency which will induce voltages exceeding the
capacitor's breakdown voltage, which is artificially reduced by
puncturing the tags.

The Unsolved Problem

[0011] Despite numerous advances in EAS systems over the past few decades,
enabling conventional bar code symbol readers with EAS capabilities, at
the time of manufacture, as well after purchase during upgrading efforts,
has been both a component and labor intensive activity.

[0012] Therefore, there still remains a great need in the art for an
improved method of and apparatus for enabling hand-supportable and
countertop-supportable bar code symbol reading systems with electronic
article surveillance (EAS) capabilities, while avoiding the shortcomings
and drawbacks of prior art systems and methodologies.

OBJECTS AND SUMMARY

[0013] Accordingly, a primary object of the present disclosure is to
provide an improved method of and apparatus for enabling hand-supportable
and countertop-supportable bar code symbol reading systems with
electronic article surveillance (EAS) capabilities, while avoiding the
shortcomings and drawbacks of prior art systems and methodologies.

[0014] Another object of the present invention is to provide such an
improved method of and apparatus for incorporating primary components of
an EAS system into hand-supportable and countertop-supportable bar code
symbol reading systems.

[0015] Another object is to provide such apparatus in the form of a
hand-supportable bar digital-imaging bar code symbol reading system
having an EAS coil and cable interface circuitry integrated within a
faceplate bezel structure that is installed about its imaging window.

[0016] Another object is to provide such an apparatus in the form of a
hand-supportable laser-scanning bar code symbol reading system having an
EAS coil and cable interface circuitry integrated within a faceplate
bezel structure that is installed about its scanning window.

[0017] Another object is to provide an EAS cable assembly that
incorporates one or more EAS antenna coils embedded into recesses formed
within a faceplate bezel that is adapted for easy application about the
faceplate (i.e. window) of a hand-supportable or countertop-supportable
bar code symbol reading system.

[0018] Another object is to provide a method of incorporating a
multi-component EAS subsystem into a hand-supportable or
countertop-supportable bar code symbol reading system in a part and labor
intensive activity.

[0019] Another object is to provide a way of reducing the number of parts
and assembly steps required to incorporate an EAS subsystem into a
hand-supportable or countertop-supportable bar code symbol reading
system.

[0020] Another object is to provide a faceplate bezel adapted for
application about the scanning or imaging window of a hand-supportable
and/or countertop-supportable bar code symbol reader, and having a recess
within which an EAS antenna coil fabricated to specification of a cable
vendor, can be embedded and delivered as an EAS subassembly prequalified
and ready for installation on the bar code symbol deployed in the field.

[0021] Another object of the present invention is to provide an EAS
assembly that reduces the number of assembly steps and parts that must be
maintained in inventory.

[0022] Another object of the present invention is to provide a
prequalified EAS cable assembly that incorporates EAS antenna coils (i.e.
wire loops) embedded into a finished faceplate bezel that is applied
about the scanning or imaging window of a bar code symbol reader at the
time of manufacture of the bar code symbol reader, and after the bar code
symbol reader has been manufactured and deployed in the field.

[0023] Another object of the present invention is to provide a faceplate
bezel that is designed to receive any prequalified EAS cable assembly
that has been fabricated to specification by a cable vendor, and which
can be assembled together as an EAS-enabling faceplate bezel in a single
procedural step on the assembly line.

[0024] Another object of the present invention is to provide an
EAS-enabling faceplate bezel structure that is quickly mounted about
imaging or scanning window of a hand-supportable and
countertop-supportable bar code symbol reading system, using simple
threaded fasteners or other suitable fastening means.

[0025] Another object of the present invention is to provide an
EAS-enabling faceplate bezel and cable assembly that can be used to
upgrade any modular-type hand-supportable and countertop-supportable bar
code symbol reading system with EAS functionality in a quick and easy
manner, without re-designing the bar code symbol reading system.

[0026] Another object is to provide a method of providing a bar code
symbol reading system with EAS tag deactivation capabilities.

[0027] These and other objects will become apparent hereinafter and in the
Claims appended hereto.

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more fully understand the Objects, the following
Detailed Description of the Illustrative Embodiments should be read in
conjunction with the accompanying Drawings, wherein:

[0029]FIG. 1 is a perspective view of an illustrative embodiment of a
hand-supportable/countertop-supportable digital-imaging based bar code
symbol reading system incorporating an EAS subsystem within a faceplate
bezel structure installed about its imaging window, and shown being
operated in its automatically-triggered counter-top supported mode of bar
code symbol reading operation;

[0030] FIG. 2A is a first perspective exploded view of the digital-imaging
based bar code symbol reading system of the illustrative embodiment
depicted in FIG. 1, showing its printed circuit (PC) board assembly
arranged between the front and rear portions of the system housing, with
the hinged base being pivotally connected to the rear portion of the
system housing by way of an axle structure;

[0031] FIG. 2B is a second perspective/exploded view of the
digital-imaging based bar code symbol reading system of the illustrative
embodiment shown in FIG. 1;

[0032]FIG. 3 is a plan view of the rear side of a first illustrative
embodiment of the EAS-enabling bezel faceplate incorporating components
of the EAS subsystem, and shown removed from its digital-imaging based
bar code symbol reading system of FIG. 1;

[0033]FIG. 4A is a schematic block diagram describing the major system
components of the digital-imaging based bar code symbol reading system
illustrated in FIGS. 1 through 3;

[0034]FIG. 4B is a schematic block diagram of the digital-imaging based
bar code symbol reading system of FIG. 1, showing the 3D imaging volume
and 3D EAS field(s) supported by the system when equipped with the
EAS-enabling bezel faceplate of FIG. 3, installed about its imaging
window;

[0035]FIG. 5 is a perspective view of the digital-imaging based bar code
symbol reading system of FIG. 1, shown operated in its manually-triggered
hand-supported mode of operation;

[0036]FIG. 6A is a perspective view of a laser-scanning bar code symbol
reading system supporting an ultra-thin EAS-enabling bezel faceplate
realized as a flexible printed circuit, and applied about the laser
scanning window (i.e. faceplate) of the system;

[0037]FIG. 6B is a perspective view of the EAS-enabling bezel faceplate
of the second illustrative embodiment shown in FIG. 7, shown being
applied to the front surface of the laser-scanning bar code symbol
reading system as shown in FIG. 6A;

[0038] FIG. 7 is a perspective view of the rear surface of the second
illustrative embodiment of the EAS-enabling bezel faceplate shown in
FIGS. 6A and 6B, and supporting the realization of deactivation and
detection coils and a cable interface circuit, realized on its flexible
printed circuit (PC) substrate, molded to the front surface counter of
the system housing about its laser scanning window; and

[0039] FIG. 8 is a schematic block diagram describing the major system
components of the laser-scanning based bar code symbol reading system
illustrated in FIGS. 6A through 7.

DETAILED DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENTS

[0040] Referring to the figures in the accompanying Drawings, the various
illustrative embodiments of the apparatus and methodologies will be
described in great detail, wherein like elements will be indicated using
like reference numerals.

[0041] In general, the EAS-enabling faceplate bezels can be mounted on bar
code symbol reading systems of various designs. For purposes of
illustration, FIGS. 1 through 3 show a first illustrative embodiment of
an EAS-enabling faceplate bezel mounted about the imaging window of a
digital-imaging bar code symbol reading system. FIGS. 6A through 7 show a
second illustrative embodiment of an EAS-enabling faceplate bezel mounted
about the scanning window of a laser scanning bar code symbol reading
system. These illustrative embodiments will now be described in greater
technical detail.

First Illustrative Embodiment of the EAS-Enabled Bar Code Symbol Reading
System

[0042] Referring now to FIGS. 1 through 3, a first illustrative embodiment
of an EAS-enabling digital-imaging bar code symbol reading system 1 will
be described in detail.

[0043] As shown in FIGS. 1, 2A and 2B, the digital-imaging bar code symbol
reading system 1 comprises: a hand-supportable housing 2 having (i) a
front housing portion 2B with a window aperture 6 and an imaging window
panel 3 installed therein; and (ii) a rear housing portion 2A. As shown,
a single PC board based optical bench 8 (having optical subassemblies
mounted thereon) is supported between the front and rear housing portions
2A and 3B which, when brought together, form an assembled unit. A base
portion 4 is connected to the assembled unit by way of a pivot axle
structure 31 that passes through the bottom portion of the imager housing
and the base portion so that the hand-supportable housing and base
portion are able to rotate relative to each other. The plug portion 57 of
the host/imager interface cable 10 passes through a port 32 formed in the
rear of the rear housing portion, and interfaces with connector 75
mounted on the PC board 8. Also, shown in FIG. 1, flexible EAS cable 402
is connected to interface cable 10 using clips or like fasteners all the
way to the EAS module 404, and EAS cable 403 interfacing the EAS module
404 and the host computer 91 at the POS station.

[0044] In FIG. 1, the digital-imaging based system 1 is shown being used
in a hands-free, countertop-supportable mode of automatically-activated
operation, whereas in FIG. 5, the digital-imaging based system 1 is shown
being used in a hand-supported manually triggered mode of operation. It
is understood, however, that the system also supports a hand-supportable
automatically-activated mode of operation, as well.

[0045] As shown in FIG. 3, the digital-imaging based code symbol reading
system 1 comprises a number of subsystem components, namely: an image
formation and detection (i.e. camera) subsystem 21 having image formation
(camera) optics 34 for producing a field of view (FOV) upon an object to
be imaged and a CMOS or like area-type image detection array 35 for
detecting imaged light reflected off the object during illumination
operations in an image capture mode in which at least a plurality of rows
of pixels on the image detection array are enabled; a LED-based
illumination subsystem 22 employing an LED illumination array 32 for
producing a field of narrow-band wide-area illumination 26 within the
entire FOV 33 of the image formation and detection subsystem 21, which is
reflected from the illuminated object and transmitted through a
narrow-band transmission-type optical filter 40 realized within the
hand-supportable and detected by the image detection array 35, while all
other components of ambient light are substantially rejected; an object
targeting illumination subsystem 31 for generating a narrow-area
targeting illumination beam into the FOV, as show in FIG. 5, to help
allow the user to align bar code symbols within the active portion of the
FOV where imaging occurs; an IR-based object motion detection and
analysis subsystem 20 for producing an IR-based object detection field 32
within the FOV of the image formation and detection subsystem 21; an
automatic light exposure measurement and illumination control subsystem
24 for controlling the operation of the LED-based illumination subsystem
22; an image capturing and buffering subsystem 25 for capturing and
buffering 2-D images detected by the image formation and detection
subsystem 21; a digital image processing subsystem 26 for processing 2D
digital images captured and buffered by the image capturing and buffering
subsystem 25 and reading 1D and/or 2D bar code symbols represented
therein; and an input/output subsystem 27 for outputting processed image
data and the like to an external host system or other information
receiving or responding device; a system memory 29 for storing data
implementing a configuration table 29A of system configuration parameters
(SCPs); a retail RDBMS server 333 interfaced with a transceiver, for
supporting POS product pricing and related POS services at the host
computing system to which the bar code symbol reading system is
interfaced; an electronic article surveillance (EAS) subsystem 28 for
generating an EAS tag deactivation field and an EAS tag detection field,
under the supervision of control subsystem 30; and an EAS-enabling
faceplate bezel 400 embodying the primary subcomponents of the EAS
subsystem 28 (e.g. antenna coils 28A, 28D and cable interface circuit
28F), and allowing a flexible EAS cable 402 to pass beneath the system
and piggy-back onto the scanner cable assembly provided in the lower rear
portion of the bar code symbol reader, and interface with EAS module 404,
as shown in FIG. 4B.

[0046] The primary function of the object targeting subsystem 31 is to
automatically generate and project visible linear-targeting illumination
beam across the central extent of the FOV of the system in response to
either (i) the automatic detection of an object during hand-held imaging
modes of system operation, or (ii) manual detection of an object by an
operator when s/he manually actuates the manually-actuatable trigger
switch 5A. In order to implement the object targeting subsystem 31, the
OCS assembly 78 also comprises a fourth support structure for supporting
the pair of beam folding mirrors above a pair of aperture slots, which in
turn are disposed above a pair of visible LEDs arranged on opposite sites
of the FOV optics 34 so as to generate a linear visible targeting beam 70
that is projected off the second FOV folding 75 and out the imaging
window 3, as shown and described in detail in US Patent Publication No.
US20080314985 A1, incorporated herein by reference in its entirety.

[0047] The primary function of the object motion detection and analysis
subsystem 20 is to automatically produce an object detection field 32
within the FOV 33 of the image formation and detection subsystem 21, to
detect the presence of an object within predetermined regions of the
object detection field 32, as well as motion and velocity information
about objects therewithin, and to generate control signals which are
supplied to the system control subsystem 30 for indicating when and where
an object is detected within the object detection field of the system. As
shown in FIG. 2B, IR LED 90A and IR photodiode 90B are supported in the
central lower portion of the optically-opaque structure 133, below the
linear array of LEDs 23. The IR LED 90A and IR photodiode 90B are used to
implement the object motion detection subsystem 20.

[0048] The image formation and detection subsystem 21 includes image
formation (camera) optics 34 for providing a field of view (FOV) 33 upon
an object to be imaged and a CMOS area-type image detection array 35 for
detecting imaged light reflected off the object during illumination and
image acquisition/capture operations, and generating 2D digital images of
objects in the FOV, having high-resolution pixel content.

[0049] The primary function of the LED-based illumination subsystem 22 is
to produce a wide-area illumination field 36 from the LED array 23 when
an object is automatically detected within the FOV. Notably, the field of
illumination has a narrow optical-bandwidth and is spatially confined
within the FOV of the image formation and detection subsystem 21 during
modes of illumination and imaging, respectively. This arrangement is
designed to ensure that only narrow-band illumination transmitted from
the illumination subsystem 22, and reflected from the illuminated object,
is ultimately transmitted through a narrow-band transmission-type optical
filter subsystem 40 within the system and reaches the CMOS area-type
image detection array 35 for detection and processing, whereas all other
components of ambient light collected by the light collection optics are
substantially rejected at the image detection array 35, thereby providing
improved SNR, thus improving the performance of the system.

[0050] The narrow-band transmission-type optical filter subsystem 40 is
realized by (1) a high-pass (i.e. red-wavelength reflecting) filter
element embodied within or at the imaging window (i.e. optically
transparent faceplate) 3, and (2) a low-pass filter element mounted
either before the CMOS area-type image detection array 35 or anywhere
after beyond the high-pass filter element, including being realized as a
dichroic mirror film supported on at least one of the FOV folding mirrors
74 and 75, shown in FIGS. 2A and 2B.

[0051] As shown in FIG. 2B, the linear array of LEDs 23 is aligned with an
illumination-focusing lens structure 51 embodied or integrated within the
upper edge of the imaging window 3. Also, the light transmission aperture
60 formed in the PC board 8 is spatially aligned within the imaging
window 3 formed in the front housing portion 2A. The function of
illumination-focusing lens structure 51 is to focus illumination from the
single linear array of LEDs 23, and to uniformly illuminate objects
located anywhere within the working distance of the FOV of the system.

[0052] As shown in FIG. 2B, an optically-opaque light ray containing
structure 50 is mounted to the front surface of the PC board 8, about the
linear array of LEDs 23. The function of the optically-opaque light ray
containing structure 133 is to prevent transmission of light rays from
the LEDs to any surface other than the rear input surface of the
illumination-focusing lens panel 3, which uniformly illuminates the
entire FOV of the system over its working range. When the front and rear
housing panels 2B and 2A are joined together, with the PC board 8
disposed therebetween, the illumination-focusing lens panel 3 sits within
slanted cut-aways formed in the top surface of the side panels, and
illumination rays produced from the linear array of LEDs 23 are either
directed through the rear surface of the illumination-focusing lens panel
3 or absorbed by the black colored interior surface of the structure 133.

[0053] As shown in FIGS. 2A and 2B the optical component support (OCS)
assembly 78 comprises: a first inclined panel for supporting the FOV
folding mirror above the FOV forming optics, and a second inclined panel
for supporting the second FOV folding mirror above the light transmission
aperture 60. With this arrangement, the FOV employed in the image
formation and detection subsystem 21, and originating from optics
supported on the rear side of the PC board 8, is folded twice, in space,
and then projected through the light transmission aperture and out of the
imaging window of the system.

[0054] The automatic light exposure measurement and illumination control
subsystem 24 performs two primary functions: (1) to measure, in
real-time, the power density [joules/cm] of photonic energy (i.e. light)
collected by the optics of the system at about its image detection array
35, and to generate auto-exposure control signals indicating the amount
of exposure required for good image formation and detection; and (2) in
combination with the illumination array selection control signal provided
by the system control subsystem 30, to automatically drive and control
the output power of the LED array 23 in the illumination subsystem 22, so
that objects within the FOV of the system are optimally exposed to
LED-based illumination and optimal images are formed and detected at the
image detection array 35. The OCS assembly 78 also comprises a third
support panel for supporting the parabolic light collection mirror
segment 79 employed in the automatic exposure measurement and
illumination control subsystem 24. Using this mirror 78, a narrow light
collecting FOV is projected out into a central portion of the wide-area
FOV 33 of the image formation and detection subsystem 21 and focuses
collected light onto photo-detector, which is operated independently from
the area-type image sensing array 35.

[0055] The primary function of the image capturing and buffering subsystem
25 is (i) to detect the entire 2-D image focused onto the 2D image
detection array 35 by the image formation optics 34 of the system, (ii)
to generate a frame of digital pixel data for either a selected region of
interest of the captured image frame, or for the entire detected image,
and then (iii) to buffer each frame of image data as it is captured.
Notably, in the illustrative embodiment, the system has both single-shot
and video modes of imaging. In the single shot mode, a single 2D image
frame is captured during each image capture and processing cycle, or
during a particular stage of a processing cycle. In the video mode of
imaging, the system continuously captures frames of digital images of
objects in the FOV. These modes are specified in further detail in US
Patent Application Publication No. US20080314985 A1, incorporated herein
by reference in its entirety.

[0056] The primary function of the digital image processing subsystem 26
is to process digital images that have been captured and buffered by the
image capturing and buffering subsystem 25, during modes of illumination
and operation. Such image processing operations include image-based bar
code decoding methods as described in U.S. Pat. No. 7,128,266,
incorporated herein by reference.

[0057] The primary function of the EAS-enabling faceplate bezel 400 is to
incorporate (e.g. embody) primary subcomponents (e.g. coils 28B, 28D and
circuit 28F) of the EAS subsystem 28, which is disposed external to the
system housing, and quickly equip the digital imaging bar code reading
system with EAS tag deactivation (and possibly detecting) capabilities.
This is achieved by simply mounting the EAS-enabling faceplate bezel 400
about the imaging window 3, routing the EAS cable 402 back to the host
computing system 91, along with the scanner/reader interface cable 10.

[0058] In FIG. 3, the primary components of the EAS subsystem 28 are shown
as comprising: a deactivation coil 28A for generating a EAS tag
deactivation field and a detection coil 28B for generating a EAS tag
detection field, both within a 3D EAS tag detection/deactivation zone 28F
that spatially encompasses the 3D imaging volume 450 of the bar code
symbol reading system, as shown in FIG. 1; and a EAS signal supply and
processing unit or module 404 containing a discharge switch 28B, a power
generation circuit 28C and a EAS tag detection circuit, in a compact
manner, and supporting (i) a first interface with the host computing
system 91 realized using a flexible EAS cable 403, and (ii) a second
interface with the deactivation coil 28A and the detection coil 28D,
embedded within the EAS-enabling faceplate bezel structure 400, and
realized using a flexible EAS cable 402 extending between the base
portion 401 of the EAS-enabling faceplate bezel structure 400 and the
host computing system 91.

[0059] The EAS signal supply and processing module 404 further comprises a
standard AC power input and power supply circuitry well known in the art.
During operation, the power generation circuit 28C supplies the
deactivation coil 28A with electrical current through the discharge
switch 28C, which is controlled by the host computer system in a
conventional manner. The EAS tag detection/reading circuit 28E processes
electrical signals detected by the EAS detection coil 28D, and generates
data signals indicative of the detected EAS tag in the EAS
detection/deactivation zone 28H.

[0060] The primary function of the EAS tag detection field is to
automatically read EAS tags applied to priced product items, when such
product items are passed through the 3D EAS tag reading/deactivation
zone. The primary function of the EAS tag deactivation field is to
automatically deactivate EAS tags applied to purchased product items,
when such purchased items are passed through the 3D EAS tag
reading/deactivation zone 28H.

[0061] The primary function of the input/output subsystem 27 is to support
universal, standard and/or proprietary data communication interfaces with
host system 91, and output processed image data and the like to such
external host systems or devices by way of such interfaces. Examples of
such interfaces, and technology for implementing the same, are given in
U.S. Pat. No. 6,619,549, incorporated herein by reference in its
entirety.

[0062] The primary function of the system control subsystem 30 is to
provide some predetermined degree of control, coordination and/or
management signaling services to each subsystem component integrated
within the system, as shown. While this subsystem can be implemented by a
programmed microprocessor, in the preferred embodiments of the present
disclosure, this subsystem is implemented by the three-tier software
architecture supported on micro-computing platform shown in FIG. 3, and
described in U.S. Pat. No. 7,128,266, and elsewhere hereinafter.

[0063] The primary function of the manually-activatable trigger switch 5A
integrated with the housing is to enable the user, during a
manually-triggered mode of operation, to generate a control activation
signal (i.e. trigger event signal) upon manually depressing the same
(i.e. causing a trigger event), and to provide this control activation
signal to the system control subsystem 30 for use in carrying out its
complex system and subsystem control operations, described in detail
herein.

[0064] The primary function of the system configuration parameter (SCP)
table 29A in system memory is to store (in non-volatile/persistent
memory) a set of system configuration and control parameters (i.e. SCPs)
for each of the available features and functionalities, and programmable
modes of supported system operation, and which can be automatically read
and used by the system control subsystem 30 as required during its
complex operations. Notably, such SCPs can be dynamically managed as
taught in great detail in co-pending US Patent No. US20080314985 A1,
incorporated herein by reference.

Second Illustrative Embodiment of the EAS-Enabled Bar Code Symbol Reading
System

[0065]FIG. 6A shows a hand-supportable/countertop-supportable
laser-scanning bar code symbol reading system 100 supporting an
ultra-thin EAS-enabling bezel faceplate 500 realized as a custom-designed
flexible printed circuit (PC) formed on a flexible substrate, applied
about the laser scanning window of the system. The bar code symbol
reading system 100 is interfaced with a POS host computer 91 by way of
flexible scanner interface and EAS cables 402 and 403, respectively. As
shown, the POS host computer 91 is interfaced with a retail RDBMS server
333 storing database records on all consumer products offered for sale in
the retail environment, including product prices and other types of
product-related information.

[0066]FIG. 6B shows the EAS-enabling bezel faceplate 500 being applied to
the front surface of the laser-scanning bar code symbol reading system as
shown in FIG. 6A. Preferably, a suitable adhesive is applied to the
perimeter regions of the rear surface of the flexible EAS-enabling
faceplate bezel 500, and then the faceplate bezel is applied to the
surface of the housing about the faceplate (i.e. laser scanning window).
Suitable pressure is applied to the faceplate bezel to ensure strong
bonding between the applied adhesive, the faceplate bezel and the front
surface of the housing about the laser scanning window.

[0067] FIG. 7 shows the rear surface of the second illustrative embodiment
of the EAS-enabling bezel faceplate 500. As shown, the EAS tag
deactivation and detection coils 28B', 28D' and a cable interface circuit
28F' are realized in the rear surface of the flexible printed circuit
(PC) substrate, which is molded to the front surface counter of the
system housing 2B about its laser scanning window (i.e. faceplate).

[0068] As shown in FIG. 8, the laser-scanner code symbol reading subsystem
100 comprises: a hand-supportable housing 2 (2A, 2B) having a light
transmission window covered by an optically transparent window or
faceplate 3, and a base portion capable of being supported on a
countertop surface; a laser scanning engine (i.e. subsystem) 150 and
array of pattern forming mirrors, disposed in the housing, for generating
and projecting a complex of laser scanning planes through the light
transmission window, and into the 3D scanning volume 460 of the
subsystem, defined externally with respect to the light transmission
window; a scan data processing subsystem 120 for supporting automatic
processing of scan data collected from each laser scanning plane in the
system; an input/output subsystem 125 for interfacing with the image
processing subsystem; a control subsystem 137; an electronic article
surveillance (EAS) subsystem 28', disposed completely outside of the
system housing, for generating an EAS tag deactivation field and EAS tag
reading/detecting field, under the control of the PC host computer 91;
ultra-thin EAS-enabling faceplate bezel 500, supporting antenna coils
28B', 28D' and cable interface circuit 28F' on the flexible PC substrate,
and having an base portion that allows a flexible EAS cable 402 to pass
beneath the system and piggy-back onto the scanner cable assembly 10
provided in the lower rear portion of the bar code symbol reader, and
interfaces to module 404, as shown; a system memory 129 for storing data
implementing system configuration parameters (SCPs) and the like; and an
audible/visual information display subsystem (i.e. module) 300 for
visually and/or audibly displaying various types of indications to the
system operator carrying out scanning and checkout operations.

[0070] The primary function of the scan data processing subsystem 120 is
to process scan data and generate symbol character data of read or
recognized code symbols.

[0071] The primary function of the input/output subsystem 127 is to
support universal, standard and/or proprietary data communication
interfaces with host system 91. Examples of such interfaces, and
technology for implementing the same, are given in U.S. Pat. No.
6,619,549, incorporated herein by reference in its entirety.

[0072] The primary function of the manually-activatable trigger switch 5A
integrated with the housing is to enable the user, during a
manually-triggered mode of operation, to generate a control activation
signal (i.e. trigger event signal) upon manually depressing the same
(i.e. causing a trigger event), and to provide this control activation
signal to the system control subsystem 137 for use in carrying out its
complex system and subsystem control operations, described in detail
herein.

[0073] The primary function of the system configuration parameter (SCP)
table in system memory 129 is to store (in non-volatile/persistent
memory) a set of system configuration and control parameters (i.e. SCCPs)
for each of the available features and functionalities, and programmable
modes of supported system operation, and which can be automatically read
and used by the system control subsystem 137 as required during its
complex operations. Notably, such SCPs can be dynamically managed as
taught in great detail in co-pending US Patent No. US20080314985 A1,
incorporated herein by reference.

[0074] The primary function of control subsystem 137 is to orchestrate the
various subsystems in the system 100, and also process data inputs and
determine that each bar-coded product scanned at the POS checkout station
has been successfully purchased (i.e. paid for) and controlling the
deactivation of any EAS tags applied to purchased products, and the like.
While this subsystem can be implemented by a programmed microprocessor,
in the preferred embodiments of the present invention, this subsystem is
implemented by the three-tier software architecture supported on
micro-computing platform, as described in U.S. Pat. No. 7,128,266, and
elsewhere hereinafter.

[0075] In FIG. 8, the primary components of the EAS subsystem 28' are
shown as comprising: a deactivation coil 28A' for generating a EAS tag
deactivation field and a detection coil 28D' for generating a EAS tag
detection field, both within a 3D EAS tag detection/deactivation zone
128H that spatially encompasses the 3D scanning volume 460 of the bar
code symbol reading system; and the EAS signal supply and processing unit
or module 404, shown in FIG. 4B, containing a discharge switch 28B, a
power generation circuit 28C and a EAS tag detection circuit, 28E. As
shown, module 404 also supports (i) a first interface connecting the
deactivation coil 28A' and the detection coil 28D' (formed on the
EAS-enabling faceplate bezel structure 500) by flexible EAS cable 402,
and (ii) a second interface connecting to the host computing system 91 by
flexible EAS cable 403, as shown in FIG. 6A.

[0076] The primary function of the EAS tag detection field is to
automatically read EAS tags applied to priced product items, when such
product items are passed through the 3D EAS tag reading/deactivation zone
460. The primary function of the EAS tag deactivation field is to
automatically deactivate EAS tags applied to purchased product items,
when such purchased items are passed through the 3D EAS tag
reading/deactivation zone 28H during deactivation operations. The primary
function of the EAS tag detecting field is to automatically detect EAS
tags applied to product items as passed through the 3D EAS tag
reading/deactivation zone 28H during detection operations.

Modifications that Come to Mind

[0077] The illustrative embodiments described above have shown several
different classes of bar code symbol reading systems employing
EAS-enabling faceplate bezel structures of various types, including
ultra-thin applique-type face-bezel designs shown in FIGS. 6A through 8,
where the flexible EAS cable 402 is shown running beneath the system
housing 2A, 2B along the course of the flexible scanner interface cable
10 and terminating at the EAS controller 404, which can be located
anywhere at the POS station. It is understood that flexible EAS cable 402
can run downward through an aperture formed in the countertop surface, to
the EAS controller 404 located under the countertop of the POS station,
instead of being routed along the scanner interface cable 10.

[0078] It is understood that the EAS cable 402 can be alternatively
realized as a thin flexible printed circuit (PC) cable extending from the
base portion 502 of the EAS-enabling faceplate bezel 500 to the EAS
controller 404 located beneath the POS countertop, near the host computer
system 91, or elsewhere at the POS station. This thin flexible EAS cable
also can be run downward through an aperture formed in the countertop
surface, to the EAS controller 404 located under the countertop of the
POS station, instead of being routed along the scanner interface cable
10.

[0079] In alternative embodiments, the bar code symbol reading system can
be provided with a wireless data communication interface to the POS host
computer 91, by replacing the scanner interface cable 10 with a wireless
data communication interface link, well known in the art. In such
instances, the flexible EAS cable, however realized, can be routed to its
EAS controller 404, wherever it might be installed at the POS station.

[0080] Several modifications to the illustrative embodiments have been
described above. It is understood, however, that various other
modifications to the illustrative embodiment will readily occur to
persons with ordinary skill in the art. All such modifications and
variations are deemed to be within the scope of the accompanying Claims.